JP4286217B2 - Paper fabric - Google Patents

Abstract

A paper machine fabric comprising at least two separate layers formed using at least two separate yarn systems: one constituting the paper side and comprising machine direction and cross machine direction yarns and the other constituting the machine side and comprising machine direction and cross machine direction yarns, the yarn systems being arranged to form independent structures in both directions of the fabric. The structures are bound together with binder yarns, a binder yarn being arranged to form part of the weave of a layer on the paper side surface and arranged to be interwoven with a layer of the machine side by being interwoven under at least one yarn in the machine side layer. The number of machine direction yarns in the layer constituting the machine side is larger than the number of machine direction yarns in the layer constituting the paper side.

Description

  The present invention relates to at least two separate yarn structures, namely a yarn structure comprising a paper side and comprising machine direction and cross machine direction yarns, and a machine side and machine direction and cross machine direction yarns. A paper fabric comprising at least two separate layers formed using a yarn structure comprising: the yarn structure is arranged to form an independent structure in the machine direction and the cross machine direction of the fabric; The structures are bounded by binder yarns that are arranged to form part of the weaving layer on the side of the paper and are interwoven under at least one yarn of the machine side layer Are arranged so as to be interwoven with the machine-side layer.

  Conventional three-layer papermaking fabrics and structures that border a binder yarn set are known in the art. A conventional three-layer papermaking fabric comprises two separate layers: a paper side layer and a machine side layer. The paper side layer and the machine side layer are mainly interconnected by a binder weft which functions as a binder yarn. Bonding with the binder yarn is usually done in each fourth top and bottom yarn set, i.e., relatively infrequently. On the upper side, the coupling takes place on one upper warp and on the bottom side under one bottom warp. The binder yarn does not contribute to the formation of the paper side, but contributes to the bonding of the layers. Swedish patent 420,852 describes this technique.

  U.S. Pat. Nos. 4,501,303, 5,967,195, and 5,826,627 are used, for example, to bond structures using binder yarns. It describes the technology to be used. In a structure in which a binder yarn group is used instead of the binder yarn to touch the boundary, this binder yarn group is capable of bonding the layers. The binder yarn set comprises two adjacent binder yarns, one of these binder yarns establishing the weaving of the paper side, the other under one machine side bottom warp yarn, Bond the machine side layer at the same time, and vice versa. The path of the set of binder yarns on the paper side establishes a weft path similar to the weft.

  In general, in a conventional three-layer papermaking fabric and in a structure bordering a set of binder yarns, the diameter of the upper warp is clearly smaller than the bottom warp. The difference in diameter between the top warp of 0.13 mm and the bottom warp of 0.21 mm is generally used. In these structures, each upper warp of the paper side layer is bordered in a similar manner to the upper weft according to repeated weaving of the paper side, and each bottom warp of the machine side layer is The bottom weft is bounded in the same way according to the repeated weaving on the machine side.

  Both the conventional three-layer papermaking fabric and the structure bordering the binder yarn generally use the same amount of top warp as the bottom warp, ie the warp ratio is 1: 1. Since the number of upper warps is equal to the number of bottom warps, the weft density cannot be increased sufficiently. A thick bottom warp and a relatively high density top warp also complicate the increase in weft density. When the weft density remains low, the opening on the paper side surface has a rectangular shape located on the short side, that is, the long side is parallel to the machine direction. When the paper web is formed, the paper fibers are oriented in the machine direction. In other words, the paper fiber and the opening of the papermaking fabric are parallel, resulting in insufficient support for the paper fiber.

  In the structure that borders the binder yarn set, the yarn in this binder yarn set is one binder yarn that falls in the fabric from the paper side to bond the layers, and the other binder In order to form a paper side surface, it intersects at a point up in the fabric. The upper wefts located on both sides of the intersecting portion press the upper warp downward at the intersecting portion, and at the same time, both yarns of the set of binder yarns do not support the upper warp from below, Go down in the fabric. Thus, the intersection remains on the lower surface rather than the surface, which can cause marking.

  Binder yarn wear within the fabric can cause "inner wear" in conventional three-layer papermaking fabrics. This wear causes the fabric to lose its original thickness inside the fabric, but the binder yarn retains its original length, causing the binder yarn to protrude from the surface of the wire and the paper web. Exposed to the risk of marking. Strong inner wear can cause the binder yarn to break and cause the layers to delaminate from each other.

  Inner wear may also be found in structures that border the binder yarn set. A set of binder yarns formed from thin binder yarns do not bond the thick bottom warp yarns tightly, resulting in a loose structure and risk of internal wear. This creates a large gap in the papermaking fabric, resulting in the passage of water through the papermaking fabric in the papermaking machine, which can cause spots in the high speed papermaking machine. Stain occurs at the point of the paper machine where the upper wire switches to the return cycle, and in the worst case, the stain causes a reduction in the quality of the paper web. Thick paper fabrics impair the effectiveness of the vacuum and dewatering elements compared to thin paper fabrics, so that the dry paper element of the paper is reduced. Another reason for the low dry body element is the large interstitial volume, which increases “rewetting”. During rewetting, the water that has moved from the paper web to the wire is absorbed back into the paper web of the wire section after the last dewatering element before the pressing section. Since this paper web is a wet body when it enters the pressing part, the destruction increases, and on the other hand, the steam consumption in the papermaking machine increases. Both factors significantly increase the cost of the paper machine.

  The thick bottom warp also causes a tight curvature of the papermaking fabric in the machine direction, which is a problem during papermaking and dewatering. In the machine direction, a paper fabric that is not breathable does not follow the dewatering device, resulting in less turbulence and reduced dewatering and paper web formation. In the present specification, the disturbance refers to rotation and mixing of the dewatering device caused by the paper web.

  Thick paper fabrics can cause problems during edge trimming for paper webs. The effect of this edge trimming squirt is insufficient to push the fibers through the thick structure, resulting in the risk of wire blocking and reduced trimming. Edge trimming problems significantly increase wet end failure. Furthermore, the thicker the papermaking fabric, the more difficult it is to keep it normal and consequently the need for extra wash downtime.

An object of the present invention is to provide a papermaking fabric that can eliminate the disadvantages of the prior art. This is achieved by the papermaking fabric according to the invention. The papermaking fabric of the present invention comprises a yarn structure comprising a machine side warp and a cross machine direction, and a yarn comprising a machine side and a machine direction warp and cross machine. A papermaking fabric comprising at least two separate layers formed using at least two separate yarn structures comprising the structure, wherein the yarn structures have independent structures in the machine direction and the cross machine direction of the fabric. Arranged to form, these structures are joined together by binder yarns, these binder yarns are arranged to form part of the paper side layer, and the machine side layer warp and weft yarns A papermaking fabric arranged to be interwoven with the machine side layer by being interwoven under at least one of the yarns;
The warp of the machine side layer is composed of at least two kinds of warp yarns, and the number of warp yarns is larger than the number of warp yarns of the paper side layer, and is always the same in either the same stage or a different stage. In the embodiment, the machine side layers are woven together with the weft yarns of the machine side layer so that the parallel warp yarns of the machine side layer pass through the machine side layer, and the paper side layer and the machine side layer are passed through the machine side layer warp yarns. Binder yarns enter and exit the machine side layer for bonding by weaving under one or both of the above .

  The structure of the present invention allows the use of thin warp and weft yarns in both the paper side layer and the machine side layer, thereby realizing a thin structure. Since the papermaking fabric is thin, the structure also has a smaller gap than the conventional three-layer papermaking fabric and the structure bordering the binder yarn set. Small gaps result in the rewet described above in the structure. A thin warp reduces the bending strength of the papermaking fabric in the machine direction. Low bending strength allows the paper fabric to follow the paper machine dewatering device, resulting in good dewatering and paper web formation. Thin structures are also advantageous in paper web edge trimming. Extruding the fiber through a thin fabric is easy for the edge trimming jet.

  In conventional three-layer papermaking fabrics, problems may arise due to the movement of the bottom weft in the machine direction. This creates a stain on the paper. In the structure of the present invention, the machine side has more joints than the conventional three-layer papermaking fabric. The bottom weft is restrained from moving by sufficiently joining the bottom weft. A number of joints improve the diagonal stability of the papermaking fabric, which is associated with a stable papermaking fabric. A stable papermaking fabric has good performance for paper machines and contributes to the realization of a uniform paper cross section. A firm bond prevents paper movement and machine side layer movement relative to each other, thereby preventing internal wear on the fabric.

  In the structure of the present invention, the upper warp density is lower than that of the conventional three-layer papermaking fabric, i.e. on the paper side in the transverse direction of the paper machine, perpendicular to the direction in which the paper fibers are mainly oriented. Due to the long sides of the rectangular openings of the papermaking fabric, the upper weft density can be increased, thereby achieving optimum fiber support and dewatering.

  Because the overall warp density in the structure of the present invention is high, the elongation of the papermaking fabric in the machine direction remains lower than in the structure bordering the conventional three-layer papermaking fabric and binder yarn set. Furthermore, in the structure of the present invention, each other bottom warp passes straight through the fabric than each other bottom warp, and as a result, the elongation of the fabric in the machine direction is reduced.

  In the structure of the present invention, the cover factor of the top warp is clearly lower than the cover factor of the bottom warp, thereby producing a funnel-like capillary that is formed in the structure and is advantageous for dehydration. In the case of rewet, such a structure is advantageous because capillary forces move water from the papermaking fabric towards the machine side of the structure. The warp cover factor is defined as follows.

Cover factor of warp = d × n
Here, d = warp diameter (cm) and n = number of warps / cm.

  In the structure that borders the set of binder yarns, the support for the upper warp yarn at the intersection of the binder yarns is weakened from below, so this upper warp yarn is kept lower than its surroundings at this location, so that the location is , Stains the paper. In an embodiment of the present invention, a good support bridge structure is formed from a replacement weft at the place where the binder yarn goes down to join the machine side, and the bridge is flush with the periphery of the place. Lift up so that no stains occur Since the fabric of the present invention does not have a set of binder yarns that harden the structure, the bottom side weft density can be increased without making the fabric too stiff, with the machine side being more And the fabric has greater wear resistance.

  The papermaking fabric of the present invention comprises at least two machine direction yarn structures, such as an upper warp structure and a bottom warp structure, and at least two machine cross direction yarn structures, such as an upper weft structure and a bottom weft structure. This upper weft structure comprises at least a replacement weft. Also, the fabric structure always comprises a binder yarn structure. In the present invention, the yarn structure constituting the paper side includes a substitution weft, and the binder yarn is woven on both sides thereof. The replacement wefts are arranged to complete the two yarn paths formed by the two binder yarns described above on the paper side where the two binder yarns are woven with the machine side.

  Next, the present invention will be described in detail using embodiments shown in the accompanying drawings.

  1 to 6 show an embodiment of the papermaking fabric of the present invention comprising an upper warp structure and a bottom warp structure composed of two bottom warps. The upper warp structure and the upper weft structure constitute the paper side layer, and the bottom warp structure and the bottom weft structure constitute the machine side layer. There are also several machine direction yarn structures, for example, as described above, three machine direction yarn structures, an upper warp structure, and two bottom warp structures.

  1 to 6, the upper warp is denoted by reference numeral 1 and the upper weft is denoted by reference numeral 2. 1 to 6, the bottom warp is indicated by reference numerals 3 a and 3 b, and the bottom weft is indicated by reference numeral 4. The layer constituting the paper side and the layer constituting the machine side are woven together by a binder yarn structure. The binder yarn is indicated by 5. The binder yarn 5 forms part of the weaving layer on the paper side and enters and exits the machine side to join the layers by weaving under at least one bottom warp yarn 3a or 3b. To do.

The two types of bottom warp structures may include more types of bottom warps 3a and 3b, for example, about twice as many as the upper warp 1 in the upper warp structure. The bottom warp yarns 3a, 3b are considerably smaller in diameter than the bottom warp yarns in conventional three-layer papermaking fabrics. In the structure of FIGS. 1 to 6, the bottom warp yarns 3 a and 3 b are slightly smaller in diameter than the upper warp yarn 1. These bottom warps 3a, 3b may be different diameters from each other. Wherein the upper warp and bottom warp, rather almost equal or diameter equal to each other, or the one upper warp is thick, the bottom warps is either thick or.

  FIG. 2 shows the machine side showing the connection of the bottom warps 3a and 3b. In this embodiment, the bottom warp yarns 3a and 3b are bordered in the same way with the bottom warp yarn 4 in accordance with repeated weaving on the machine side.

  The structure of the present invention is formed thin using the alignment of the top and bottom warp yarns. In this structure, the upper warp yarns 1 are not all on top of each other, but partially overlap the bottom warp yarns 3a and 3b so that these warp yarns can be combined. For the same reason, the machine side is joined as close to the paper side as possible at the place where the paper side layer and the machine side layer are woven together by the binder yarn 5 to make the structure thin. A thin bottom warp contributes to the rise of the joint.

In the embodiment of the present invention according to FIGS. 1 to 6, the replacement weft 6 is formed by binder yarns woven on both sides of the replacement weft on the paper side, where the binder yarn 5 is woven with the machine side. The weft path is continuous . Bandai yarns and substitution weft yarns 6 woven between these bandai yarns form two weft yarn paths similar to the weft yarn paths of the actual upper weft yarn 2 on the paper side layer . Accordingly, the two weft yarns 5 and the replacement weft yarn 6 woven between these bandai yarns form two weft yarn paths in the paper side layer .

  In the paper side of the embodiment of the present invention shown in FIGS. 1 to 6, the upper weft yarn 2, the binder yarn 5, the replacement weft yarn 6 and the binder yarn 5 constitute a group of yarns that regularly and repeatedly penetrate the fabric. ing. The upper weft 2 is woven using a plain weave. The binder yarn 5 is woven on the paper side, i.e. lowered to join the layers by weaving under one bottom warp yarn 3a or 3b, as shown in FIGS. The bottom weft 4 forms a boundary with the bottom warp 3a using a three-legged weave, and forms a boundary with the bottom warp 3b using a three-legged weave.

In the structure in which the boundary of the binder yarn is in contact with the boundary, each binder yarn forms a boundary as a cross stitch on the paper side surface, and the five upper warp yarns remain between the parts constituting the paper side surface. . Therefore, the bonding between the paper side layer and the machine side layer is still loose, and the outermost bonding portion of the binder yarn portion constituting the paper side surface remains higher than the middle portion, and the surface is uneven. The risk of spot formation is increased. In the structure of FIGS. 1-6, only three upper warp yarns remain between the binder yarn portions that make up the paper side, and the bond is tight, thereby making the paper side uniform, and the stain in the structure. Risk is reduced.

  The table compares the preferred structure of FIGS. 1-6 with a conventional three-layer wire structure and a structure that borders a set of binder yarns. The papermaking fabric of the above table is suitable for passing through a paper machine as an alternative fabric.

  The table shows that the structure of the present invention is clearly thinner than the other structures. Therefore, the gap in the structure is also small, and this structure does not allow water to pass along the gap. In other words, little rewetting occurs in this construction, and in the paper machine, the upper wire in the return cycle does not scatter water on the paper web. The MD bending strength indicates the strength of the papermaking fabric in the machine direction. In the conventional three-layer wire structure and in the structure in contact with the binder yarn set, the bending strength is higher than that of the structure of the present invention. Advantages arising from the low bending strength of the structure of the present invention include high dry body elements and good paper formation.

  7 to 9 show a second embodiment of the papermaking fabric of the present invention. In this embodiment, the bottom warps 3a and 3b are bordered in different ways. 7 and 8 show how the binder yarn 5 enters and exits this machine side to join the layers comprising the paper side and the machine side by being woven under one bottom warp yarn 3a. Indicates what to do. The advantage of this structure is that the bottom warp structure formed by the bottom warp 3b passes through the structure more straightly than the bottom warp 3a, so that the machine direction stretchability of the papermaking fabric is extremely Stays low.

  FIG. 10 shows a third embodiment of the papermaking fabric of the present invention. In FIG. 10, the bottom warp yarns 3a and 3b, which are always woven together with the bottom weft yarn 4, pass through the fabric in parallel. In this embodiment, the binder yarn 5 which joins the layers constituting the paper side and the machine side by being folded under either the bottom warp yarn 3a or 3b enters or exits the machine side.

  FIG. 11 shows a fourth embodiment of the papermaking fabric of the present invention. In FIG. 11, the bottom warp yarns 3a and 3b, which are always woven together with the bottom weft yarn 4, pass through the fabric in parallel. In this embodiment, the binder yarn 5 which joins the layers constituting the paper side and the machine side by being folded under the bottom warp yarns 3a and 3b respectively enters and exits the machine side.

  In the embodiment of FIGS. 7 to 9, 10 and 11, the paper side is the same as that shown in the embodiment of FIGS. 1 to 6, ie, the embodiment of FIGS. Only the machine side of the embodiment is different from that of the embodiment of FIGS.

  The embodiments described above do not limit the present invention, and the present invention can be freely modified within the scope of the claims. Thus, the papermaking fabric of the present invention or details of this fabric need not be the same as shown in the figures, but other methods are possible. Said individual layers can be freely formed, i.e. the number of yarn structures varies, the important point being at least two warp structures, namely a bottom warp structure and an upper warp structure. That is. Similarly, the number of weft fabrics may vary, and the important point is that there are at least two weft fabrics, such as an upper weft fabric and a bottom weft fabric. Although the structure of the present invention described above is a three-layer structure, other multilayer structures can be implemented within the scope of the present invention. On the paper side, other weaves such as satin weave and twill weave can be used instead of plain weave. The weft of the bottom weft and the binder yarn may be freely changed within the scope of the basic spirit of the present invention. Furthermore, it should be noted that the basic idea of the present invention allows a structure in which the upper weft is completely eliminated, i.e. the paper side comprises only a replacement weft and a binder thread. On the other hand, it is also possible to form a structure in which the number of upper wefts is larger than the number of replacement wefts, that is, the number of upper wefts changes, for example, 0, 1, 2, 3, etc. The number of bottom wefts may be different from the total number of top wefts and replacement wefts. In the embodiment, the number of bottom wefts is equal to the total number of top wefts and replacement wefts, but the number of bottom wefts may not be equal.

  The path of the binder yarn 5 adjacent to the replacement weft yarn 6 in the fabric may be the same or different. The number of bonding points in the replacement weft yarn 6 on the paper side surface may be equal to or different from the number of bonding points of the adjacent binder yarn 5 on the paper side surface. When there is only one upper weft, the upper weft becomes the replacement weft 6. In the illustrated embodiment, the binder yarn and the replacement weft woven between the binder yarn 5 and the replacement weft 6 constitute a group of two weft paths on the paper side surface. The paper side may be constructed only in this group, or one or more upper wefts may be woven between this group. The coupling of the upper weft may be the same as or different from the coupling on the weft path formed by the binder yarn and the replacement yarn.

  All the above descriptions use polyester or polyamide yarns with a circular cross section. Examples of other possible yarn materials include PEN (polyethylene naphthalate) and PPS (polyethylene sulfide). However, the present invention is by no means limited to the above-described embodiments, and the present invention can be applied with different yarns. The yarn may be, for example, a 'profile yarn' that is not round in cross section and instead is, for example, flat, elliptical or other shape. The yarn may also be hollow, for example, allowing the yarn to be flattened in the fabric and leaving the structure thin. Similarly, what is known as a heterogeneous structure yarn can also be used as the yarn. The selection of the yarn characteristics affects the characteristics of the fabric, and a gradually thinning structure or a uniform paper side surface is realized.

It is a figure which shows the papermaking fabric of this invention seen from the paper side. It is a figure which shows the papermaking fabric of this invention seen from the machine side. It is a figure which shows embodiment of FIG. 1 along arrow III-III. It is a figure which shows embodiment of FIG. 1 along arrow IV-IV. It is a figure which shows embodiment of FIG. 1 along arrow VV. It is a figure which shows embodiment of FIG. 1 along arrow VI-VI. It is a figure which shows the 2nd papermaking fabric of this invention seen from the machine side. FIG. 8 shows the embodiment of FIG. 7 along arrows VII-VII. FIG. 8 shows the embodiment of FIG. 7 along arrows VIII-VIII. It is a figure which shows the 3rd papermaking fabric of this invention seen from the machine side. It is a figure which shows the 4th papermaking fabric of this invention seen from the machine side.

Claims (22)

A yarn structure comprising a machine side warp (1) and a cross-machine weft (2 ), and a machine side warp (3a, 3b) and a cross-machine direction A papermaking fabric comprising at least two separate layers formed with at least two separate yarn structures comprising a yarn structure comprising weft yarns (4), the yarn structures comprising the machine direction of the fabric and the machine Arranged to form transversely independent structures, these structures being joined together by binder yarns (5), which binder yarns (5) form part of the paper side layer. In the paper-making fabric, arranged so as to be interwoven with the machine-side layer by being interwoven under at least one of the warp and weft yarns of the machine-side layer ,
Warp of the machine side layer, consists of at least two warp yarns (3a, 3b), the number of warp threads (3a, 3b) is greater than the number of longitudinal threads (1) of the paper side layer, also, always be combined woven in together with the weft layer of the machine side in the same manner (4) in any of the same stage as different stages, parallel longitudinal yarns of the machine side layer (3a, 3b) is the machine side through the layer, the layer of the layer and the machine side of the paper side, longitudinal yarns of the machine side layer (3a, 3b) for coupling by combining weaving under one or both of the binder yarns (5) A papermaking fabric characterized in that enters and exits the machine side layer . The number of warp yarns of the machine side layer (3a, 3b) is characterized in that it is twice the number of longitudinal yarns of the paper side layer (1), paper making fabric of Claim 1. The diameter of the warp of the machine side layer (3a, 3b) are characterized by a diameter different from this longitudinal yarns (1) of the paper side layer, papermaking fabric according to claim 1 or 2. The diameter of the longitudinal yarns of the machine side layer (3a, 3b) is characterized in that equal to the longitudinal size of the thread (1) of the paper side layer, papermaking fabric according to claim 1 or 2. The papermaking fabric according to claim 1 or 2, characterized in that the diameters of at least two types of warp (3a, 3b) of the machine layer are different . Vertical yarns of the machine side layer (3a, 3b), characterized in that partially overlap the longitudinal yarns (1) of the paper side layer, according to any one of claims 1 to 5 Papermaking fabric. The yarn structure of the layer constituting the paper side includes a substitution weft yarn (6) and further binder yarns (5) woven on both sides of each of the substitution weft yarns, and the substitution weft yarn (6) is provided on the paper side. additional binder yarns two yarn paths formed by (5), said two binder yarns (5) at a point which is combined weave and the machine side layer, are arranged in so that the formation of the two The papermaking fabric according to any one of claims 1 to 6, characterized in that. At least one transverse yarn of the paper side layer, characterized in that it is woven between a yarn group consisting of two yarns path formed by the substitution weft (6) binder yarn (5), The papermaking fabric according to claim 7. One transverse yarns of the paper side layer, characterized in that it is woven between a yarn group consisting of two yarns path formed by the substitution weft (6) binder yarn (5), wherein Item 8. A papermaking fabric according to Item 7. Through path of the substituted weft said two binder yarns adjacent to the (6) (5), within the fabric, characterized in that equal to the yarn path of the substituted weft (6), paper making according to claim 7 fabric. The yarn path of the additional binder yarns within the fabric, characterized in that the different yarn paths of the substituted weft (6), paper making fabric of Claim 7 adjacent on both sides to the replacement weft. The binder yarn (5), characterized in that it has two binding points on the paper side layer on papermaking fabric of claim 7. Binding of the weft thread (2) of the paper side layer, characterized in that it is the same as the binding weft thread path formed in the layer of the paper side by the binder yarn (5) and substituted weft (6), The papermaking fabric according to claim 7. Binding of the weft thread (2) of the paper side layer, characterized in that differ from the binding weft thread path formed in the layer of the paper side by said binder yarn (5) and substituted weft (6), wherein Item 8. A papermaking fabric according to Item 7. The number of binding points of substitution weft (6) on said layer of paper side is characterized by the number of binding points equal to or different from the binder yarns (5) adjacent on the layer of the paper side, wherein Item 8. A papermaking fabric according to Item 7. The number of the substituent weft (6), the number of equal to the number of weft (2) of the paper side layer, and weft yarns of the machine side layer (4) is, weft of the paper side layer (2) The papermaking fabric according to claim 7, characterized in that it is equal to the total number of said weft replacement yarns (6). The yarn path formed by the replacement weft (6) and the binder yarns (5) are two binder yarn (5) binding points and one substituted weft (6) is formed so that the bonding site is present The papermaking fabric according to claim 7, wherein The papermaking fabric according to claim 17, wherein a plain weaving yarn path is formed in the paper side layer . The binder yarn (5), using the weave Rokuhi opening, combines with the paper-side layer and the machine side layer by aligning weaving under one bottom warp yarns of the machine side layer (3), the machine weft side of the layer (4) has a feature in that with one longitudinal yarn using woven three shed and (3a), and the weaving Sang port are combined woven and other longitudinal yarns (3b) The papermaking fabric according to claim 18. The binder yarn (5), using the weave Rokuhi port, and a layer of the layer and the machine side of the paper-side binding by combining weaving under one warp of the machine side layer, a layer of the machine side the weft (4), characterized in that it is combined weave and the other of the longitudinal thread (3b) with the one longitudinal thread (3a), and the weaving Sang port using a woven three shed, wherein Item 8. The papermaking fabric according to any one of Items 1 to 7.   21. Papermaking fabric according to any one of the preceding claims, characterized in that one, some or all of the yarns of the papermaking fabric have a different cross section than a circle.   22. A papermaking fabric according to any one of the preceding claims, characterized in that one, some or all yarns of the papermaking fabric are hollow.

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